Introduction
It is always the customer’s responsibility to de-
sign the manifolds according to the design rules
of the flexible couplings used.
Typical, manifold for multiple iSaves® are made
in hard piping, using flexible coupling as con-
nection to the iSave discharge and inlet.
This paper shows some design rules based on
Victaulic® Flexible couplings style 77 in duplex.
Other supplier of flexible couplings may have
different design rules.
(Victaulic® is a registered name of Victaulic)
Design Guide
Piping connections
Experience in the market shows that precise
welding of a steel manifold with multiple
connections is difficult. The individual position
of the manifold connections may exceed the
flexibility of a single flexible coupling.
For both iSave ERDs and APP pumps:
• To reduce stress on the discharge and
inlet it is preferred to use flexible hoses
or a minimum of 2 flexible couplings
combined on the same pipe.
• When using hard piping, it is important
to allow a gap between each individual
Victaulic connection. See “Spacing” in
table below.
• The use of only one flexible coupling to dis-
charge or inlet should be accurately controlled
to ensure the proper alignment of the manifold.
• Do not force any misaligned pipes to connect
to discharge or inlet.
• Do not use the discharge or inlet connection as
support for pipes. The pipes must have sepa-
rate support close to the end of the pipe.
Victaulic®
Flexible coupling
Style 77DX
Cut grooved
Pipe SC40
1½” 3.2 0 mm 3° - 52´ or 66 15120
2” 3.2 0 mm 3° or 52 23575
2½” 3.2 0 mm 2° - 30´ or 44 34250
3” 3.2 0 mm 2° or 36 51150
4” 6.4 0 mm 3° - 12´ or 56 84500
6” 6.4 0 mm 2° - 24´ or 36 184000
Spacing
[mm]
Max. angle
2)
[Deg.] or [mm]
Max. radial offset
1)
[mm]
End load
3)
[N]
